how to find the file : build-essential
from the following show in command line :
0% [Connecting to mirror.lupaworld.com (211.155.231.159)]
we konw the web mirror.lupaworld.com address is 211.155.231.159
so we go :
211.155.231.159
and we notice the "Ubuntu 7.04 iso "
that is :
http://211.155.231.159/ubuntu/releases/7.04/
we care about the desktop version,we click the "desktop"
go to :
http://cdimage.ubuntu.com/daily-live/current/
then click "gutsy-desktop-i386.list "
go here:
http://cdimage.ubuntu.com/daily-live/current/gutsy-desktop-i386.list
to find build-essential:
/pool/main/b/build-essential/build-essential_11.3_i386.deb
then,go here:
http://wiki.ubuntu.org.cn/%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E6%88%91%E4%BB%AC%E6%8E%A8%E8%8D%90%E7%9A%84%E6%BA%90#Feisty_.287.04.29_.E7.89.88.E6.9C.AC
to find the available source,such as:
deb http://mirror.lupaworld.com/ubuntu/archive/ feisty main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ feisty-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ feisty-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ feisty-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/archive/ feisty-proposed main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn/ feisty main restricted universe multiverse
so ,we know the main source is :
http://mirror.lupaworld.com/ubuntu/archive/
then ,we can guess the address is :
http://mirror.lupaworld.com/ubuntu/archive/pool/main/b/build-essential/build-essential_11.3_i386.deb
and its parent directory is :
http://mirror.lupaworld.com/ubuntu/archive/pool/main/b/build-essential/
we can go there to directly download the file we want.